The Study on the Treatment of Fish Market Wastewater Using Biofilm Airlift Suspension Reactor

• Main Authors: Tung-An Tsai, 蔡東安
• Other Authors: Ting-Chi Hsu
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/13209083670723131397

碩士 === 淡江大學 === 水資源及環境工程學系 === 89 === This study is a experiment for treatment efficiency from the fish market wastewater by “biofilm airlift suspension reactor system”. The experiment hydraulic retention time are 2, 4, 6, 8 and 12 hours. It aims to discuss the treatment efficiency, nitrification reaction and biological kinetics constant. According to the results of the experiment: 1.When the hydraulic retention time is 6 hours, the BOD、COD and TKN removal rate can reach 95%、80% and 78%, and the BOD、COD and TKN rate treatment efficiency can reach 1.6 (kgBOD/m3.day)、1.7(kgCOD/m3.day) and 0.5(kgTKN/m3.day). 2.When the hydraulic retention time is 6 hours, this experiment biomass can reach 14000mg/L, sludge retention time reach 60~70 days, and the nitrification rate reach 0.5kg/m3-day。 3.This study can find the “substrate inhibition”, the reason may be the high concentration of substrate. The study applies Haldane mode to compute biological kinetics constants. The maximum rate of BOD utilization (k) is 0.337(kg/kg.day), the half-velocity constant (Ks) of BOD is 0.054(kg/m3), and the inhibition constant of BOD (Ki) is 0.743kg/m3. The maximum rate of COD utilization (k) is 0.452(kg/kg.day), the half-velocity constant (Ks) of COD is 0.164(kg/m3), and the inhibition constant of COD (Ki) is 0.834kg/m3. The maximum rate of TKN utilization (k) is 0.072(kg/kg.day), the half-velocity constant (Ks) of TKN is 0.03(kg/m3), and the inhibition constant of TKN (Ki) is 0.214kg/m3. 4.When COD/TKN is less than 2, it has be found obviously nitrite accumulation. When COD/TKN is greater than 4, the nitrite accumulation has not be found. When COD/TKN is less than 2 and must reach completely nitrification, it may need to increase the amount of carrier. 5.This study keeps dissolved oxygen concentration greater than 3mg/L. The effect of nitrification by dissolved oxygen may argue more in the after study.